Bicycle exerciser



FIG. 1 is a rear perspective view of a bicycle exerciser showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a top perspective view thereof;

FIG. 4 is a bottom perspective view thereof;

FIG. 5 is a left side perspective view thereof;

FIG. 6 is a right side perspective view thereof;

FIG. 7 is a left rear perspective view thereof; and

FIG. 8 is a right front perspective view thereof. 

The ornamental design for a bicycle exerciser, as shown and described. 